Ah, figured as much. My ROMs don't have the model name anywhere, only the serial no and a small sticker denoting 3.1 and the chip position.
The chip position would point that these are indeed for the A4000, but I haven't verified that no other machine has the same positions.. (why would they?)
I guess I'll just have to try and read the contents with some prommer and see what's in them..
Thanks for the info, everyone.